/* * it87.c - Part of lm_sensors, Linux kernel modules for hardware * monitoring. * * The IT8705F is an LPC-based Super I/O part that contains UARTs, a * parallel port, an IR port, a MIDI port, a floppy controller, etc., in * addition to an Environment Controller (Enhanced Hardware Monitor and * Fan Controller) * * This driver supports only the Environment Controller in the IT8705F and * similar parts. The other devices are supported by different drivers. * * Supports: IT8705F Super I/O chip w/LPC interface * IT8712F Super I/O chip w/LPC interface * IT8716F Super I/O chip w/LPC interface * IT8718F Super I/O chip w/LPC interface * IT8720F Super I/O chip w/LPC interface * IT8726F Super I/O chip w/LPC interface * Sis950 A clone of the IT8705F * * Copyright (C) 2001 Chris Gauthron * Copyright (C) 2005-2010 Jean Delvare * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DRVNAME "it87" enum chips { it87, it8712, it8716, it8718, it8720 }; static unsigned short force_id; module_param(force_id, ushort, 0); MODULE_PARM_DESC(force_id, "Override the detected device ID"); static struct platform_device *pdev; #define REG 0x2e /* The register to read/write */ #define DEV 0x07 /* Register: Logical device select */ #define VAL 0x2f /* The value to read/write */ #define PME 0x04 /* The device with the fan registers in it */ /* The device with the IT8718F/IT8720F VID value in it */ #define GPIO 0x07 #define DEVID 0x20 /* Register: Device ID */ #define DEVREV 0x22 /* Register: Device Revision */ static inline int superio_inb(int reg) { outb(reg, REG); return inb(VAL); } static int superio_inw(int reg) { int val; outb(reg++, REG); val = inb(VAL) << 8; outb(reg, REG); val |= inb(VAL); return val; } static inline void superio_select(int ldn) { outb(DEV, REG); outb(ldn, VAL); } static inline void superio_enter(void) { outb(0x87, REG); outb(0x01, REG); outb(0x55, REG); outb(0x55, REG); } static inline void superio_exit(void) { outb(0x02, REG); outb(0x02, VAL); } /* Logical device 4 registers */ #define IT8712F_DEVID 0x8712 #define IT8705F_DEVID 0x8705 #define IT8716F_DEVID 0x8716 #define IT8718F_DEVID 0x8718 #define IT8720F_DEVID 0x8720 #define IT8726F_DEVID 0x8726 #define IT87_ACT_REG 0x30 #define IT87_BASE_REG 0x60 /* Logical device 7 registers (IT8712F and later) */ #define IT87_SIO_GPIO3_REG 0x27 #define IT87_SIO_GPIO5_REG 0x29 #define IT87_SIO_PINX2_REG 0x2c /* Pin selection */ #define IT87_SIO_VID_REG 0xfc /* VID value */ #define IT87_SIO_BEEP_PIN_REG 0xf6 /* Beep pin mapping */ /* Update battery voltage after every reading if true */ static int update_vbat; /* Not all BIOSes properly configure the PWM registers */ static int fix_pwm_polarity; /* Many IT87 constants specified below */ /* Length of ISA address segment */ #define IT87_EXTENT 8 /* Length of ISA address segment for Environmental Controller */ #define IT87_EC_EXTENT 2 /* Offset of EC registers from ISA base address */ #define IT87_EC_OFFSET 5 /* Where are the ISA address/data registers relative to the EC base address */ #define IT87_ADDR_REG_OFFSET 0 #define IT87_DATA_REG_OFFSET 1 /*----- The IT87 registers -----*/ #define IT87_REG_CONFIG 0x00 #define IT87_REG_ALARM1 0x01 #define IT87_REG_ALARM2 0x02 #define IT87_REG_ALARM3 0x03 /* The IT8718F and IT8720F have the VID value in a different register, in Super-I/O configuration space. */ #define IT87_REG_VID 0x0a /* The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b for fan divisors. Later IT8712F revisions must use 16-bit tachometer mode. */ #define IT87_REG_FAN_DIV 0x0b #define IT87_REG_FAN_16BIT 0x0c /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */ static const u8 IT87_REG_FAN[] = { 0x0d, 0x0e, 0x0f, 0x80, 0x82 }; static const u8 IT87_REG_FAN_MIN[] = { 0x10, 0x11, 0x12, 0x84, 0x86 }; static const u8 IT87_REG_FANX[] = { 0x18, 0x19, 0x1a, 0x81, 0x83 }; static const u8 IT87_REG_FANX_MIN[] = { 0x1b, 0x1c, 0x1d, 0x85, 0x87 }; #define IT87_REG_FAN_MAIN_CTRL 0x13 #define IT87_REG_FAN_CTL 0x14 #define IT87_REG_PWM(nr) (0x15 + (nr)) #define IT87_REG_VIN(nr) (0x20 + (nr)) #define IT87_REG_TEMP(nr) (0x29 + (nr)) #define IT87_REG_VIN_MAX(nr) (0x30 + (nr) * 2) #define IT87_REG_VIN_MIN(nr) (0x31 + (nr) * 2) #define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2) #define IT87_REG_TEMP_LOW(nr) (0x41 + (nr) * 2) #define IT87_REG_VIN_ENABLE 0x50 #define IT87_REG_TEMP_ENABLE 0x51 #define IT87_REG_BEEP_ENABLE 0x5c #define IT87_REG_CHIPID 0x58 #define IT87_REG_AUTO_TEMP(nr, i) (0x60 + (nr) * 8 + (i)) #define IT87_REG_AUTO_PWM(nr, i) (0x65 + (nr) * 8 + (i)) #define IN_TO_REG(val) (SENSORS_LIMIT((((val) + 8)/16),0,255)) #define IN_FROM_REG(val) ((val) * 16) static inline u8 FAN_TO_REG(long rpm, int div) { if (rpm == 0) return 255; rpm = SENSORS_LIMIT(rpm, 1, 1000000); return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254); } static inline u16 FAN16_TO_REG(long rpm) { if (rpm == 0) return 0xffff; return SENSORS_LIMIT((1350000 + rpm) / (rpm * 2), 1, 0xfffe); } #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div))) /* The divider is fixed to 2 in 16-bit mode */ #define FAN16_FROM_REG(val) ((val)==0?-1:(val)==0xffff?0:1350000/((val)*2)) #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\ ((val)+500)/1000),-128,127)) #define TEMP_FROM_REG(val) ((val) * 1000) #define PWM_TO_REG(val) ((val) >> 1) #define PWM_FROM_REG(val) (((val)&0x7f) << 1) static int DIV_TO_REG(int val) { int answer = 0; while (answer < 7 && (val >>= 1)) answer++; return answer; } #define DIV_FROM_REG(val) (1 << (val)) static const unsigned int pwm_freq[8] = { 48000000 / 128, 24000000 / 128, 12000000 / 128, 8000000 / 128, 6000000 / 128, 3000000 / 128, 1500000 / 128, 750000 / 128, }; struct it87_sio_data { enum chips type; /* Values read from Super-I/O config space */ u8 revision; u8 vid_value; u8 beep_pin; /* Features skipped based on config or DMI */ u8 skip_vid; u8 skip_fan; u8 skip_pwm; }; /* For each registered chip, we need to keep some data in memory. The structure is dynamically allocated. */ struct it87_data { struct device *hwmon_dev; enum chips type; u8 revision; unsigned short addr; const char *name; struct mutex update_lock; char valid; /* !=0 if following fields are valid */ unsigned long last_updated; /* In jiffies */ u8 in[9]; /* Register value */ u8 in_max[8]; /* Register value */ u8 in_min[8]; /* Register value */ u8 has_fan; /* Bitfield, fans enabled */ u16 fan[5]; /* Register values, possibly combined */ u16 fan_min[5]; /* Register values, possibly combined */ s8 temp[3]; /* Register value */ s8 temp_high[3]; /* Register value */ s8 temp_low[3]; /* Register value */ u8 sensor; /* Register value */ u8 fan_div[3]; /* Register encoding, shifted right */ u8 vid; /* Register encoding, combined */ u8 vrm; u32 alarms; /* Register encoding, combined */ u8 beeps; /* Register encoding */ u8 fan_main_ctrl; /* Register value */ u8 fan_ctl; /* Register value */ /* The following 3 arrays correspond to the same registers. The * meaning of bits 6-0 depends on the value of bit 7, and we want * to preserve settings on mode changes, so we have to track all * values separately. */ u8 pwm_ctrl[3]; /* Register value */ u8 pwm_duty[3]; /* Manual PWM value set by user (bit 6-0) */ u8 pwm_temp_map[3]; /* PWM to temp. chan. mapping (bits 1-0) */ /* Automatic fan speed control registers */ u8 auto_pwm[3][4]; /* [nr][3] is hard-coded */ s8 auto_temp[3][5]; /* [nr][0] is point1_temp_hyst */ }; static inline int has_16bit_fans(const struct it87_data *data) { /* IT8705F Datasheet 0.4.1, 3h == Version G. IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J. These are the first revisions with 16bit tachometer support. */ return (data->type == it87 && data->revision >= 0x03) || (data->type == it8712 && data->revision >= 0x08) || data->type == it8716 || data->type == it8718 || data->type == it8720; } static inline int has_old_autopwm(const struct it87_data *data) { /* The old automatic fan speed control interface is implemented by IT8705F chips up to revision F and IT8712F chips up to revision G. */ return (data->type == it87 && data->revision < 0x03) || (data->type == it8712 && data->revision < 0x08); } static int it87_probe(struct platform_device *pdev); static int __devexit it87_remove(struct platform_device *pdev); static int it87_read_value(struct it87_data *data, u8 reg); static void it87_write_value(struct it87_data *data, u8 reg, u8 value); static struct it87_data *it87_update_device(struct device *dev); static int it87_check_pwm(struct device *dev); static void it87_init_device(struct platform_device *pdev); static struct platform_driver it87_driver = { .driver = { .owner = THIS_MODULE, .name = DRVNAME, }, .probe = it87_probe, .remove = __devexit_p(it87_remove), }; static ssize_t show_in(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr])); } static ssize_t show_in_min(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr])); } static ssize_t show_in_max(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr])); } static ssize_t set_in_min(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); unsigned long val; if (strict_strtoul(buf, 10, &val) < 0) return -EINVAL; mutex_lock(&data->update_lock); data->in_min[nr] = IN_TO_REG(val); it87_write_value(data, IT87_REG_VIN_MIN(nr), data->in_min[nr]); mutex_unlock(&data->update_lock); return count; } static ssize_t set_in_max(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); unsigned long val; if (strict_strtoul(buf, 10, &val) < 0) return -EINVAL; mutex_lock(&data->update_lock); data->in_max[nr] = IN_TO_REG(val); it87_write_value(data, IT87_REG_VIN_MAX(nr), data->in_max[nr]); mutex_unlock(&data->update_lock); return count; } #define show_in_offset(offset) \ static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ show_in, NULL, offset); #define limit_in_offset(offset) \ static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ show_in_min, set_in_min, offset); \ static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ show_in_max, set_in_max, offset); show_in_offset(0); limit_in_offset(0); show_in_offset(1); limit_in_offset(1); show_in_offset(2); limit_in_offset(2); show_in_offset(3); limit_in_offset(3); show_in_offset(4); limit_in_offset(4); show_in_offset(5); limit_in_offset(5); show_in_offset(6); limit_in_offset(6); show_in_offset(7); limit_in_offset(7); show_in_offset(8); /* 3 temperatures */ static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr])); } static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr])); } static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr])); } static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); long val; if (strict_strtol(buf, 10, &val) < 0) return -EINVAL; mutex_lock(&data->update_lock); data->temp_high[nr] = TEMP_TO_REG(val); it87_write_value(data, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]); mutex_unlock(&data->update_lock); return count; } static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); long val; if (strict_strtol(buf, 10, &val) < 0) return -EINVAL; mutex_lock(&data->update_lock); data->temp_low[nr] = TEMP_TO_REG(val); it87_write_value(data, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]); mutex_unlock(&data->update_lock); return count; } #define show_temp_offset(offset) \ static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \ show_temp, NULL, offset - 1); \ static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \ show_temp_max, set_temp_max, offset - 1); \ static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \ show_temp_min, set_temp_min, offset - 1); show_temp_offset(1); show_temp_offset(2); show_temp_offset(3); static ssize_t show_sensor(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); u8 reg = data->sensor; /* In case the value is updated while we use it */ if (reg & (1 << nr)) return sprintf(buf, "3\n"); /* thermal diode */ if (reg & (8 << nr)) return sprintf(buf, "4\n"); /* thermistor */ return sprintf(buf, "0\n"); /* disabled */ } static ssize_t set_sensor(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); long val; if (strict_strtol(buf, 10, &val) < 0) return -EINVAL; mutex_lock(&data->update_lock); data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE); data->sensor &= ~(1 << nr); data->sensor &= ~(8 << nr); if (val == 2) { /* backwards compatibility */ dev_warn(dev, "Sensor type 2 is deprecated, please use 4 " "instead\n"); val = 4; } /* 3 = thermal diode; 4 = thermistor; 0 = disabled */ if (val == 3) data->sensor |= 1 << nr; else if (val == 4) data->sensor |= 8 << nr; else if (val != 0) { mutex_unlock(&data->update_lock); return -EINVAL; } it87_write_value(data, IT87_REG_TEMP_ENABLE, data->sensor); mutex_unlock(&data->update_lock); return count; } #define show_sensor_offset(offset) \ static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR, \ show_sensor, set_sensor, offset - 1); show_sensor_offset(1); show_sensor_offset(2); show_sensor_offset(3); /* 3 Fans */ static int pwm_mode(const struct it87_data *data, int nr) { int ctrl = data->fan_main_ctrl & (1 << nr); if (ctrl == 0) /* Full speed */ return 0; if (data->pwm_ctrl[nr] & 0x80) /* Automatic mode */ return 2; else /* Manual mode */ return 1; } static ssize_t show_fan(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], DIV_FROM_REG(data->fan_div[nr]))); } static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]))); } static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr])); } static ssize_t show_pwm_enable(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", pwm_mode(data, nr)); } static ssize_t show_pwm(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm_duty[nr])); } static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr, char *buf) { struct it87_data *data = it87_update_device(dev); int index = (data->fan_ctl >> 4) & 0x07; return sprintf(buf, "%u\n", pwm_freq[index]); } static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); long val; u8 reg; if (strict_strtol(buf, 10, &val) < 0) return -EINVAL; mutex_lock(&data->update_lock); reg = it87_read_value(data, IT87_REG_FAN_DIV); switch (nr) { case 0: data->fan_div[nr] = reg & 0x07; break; case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break; case 2: data->fan_div[nr] = (reg & 0x40) ? 3 : 1; break; } data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]); mutex_unlock(&data->update_lock); return count; } static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); unsigned long val; int min; u8 old; if (strict_strtoul(buf, 10, &val) < 0) return -EINVAL; mutex_lock(&data->update_lock); old = it87_read_value(data, IT87_REG_FAN_DIV); /* Save fan min limit */ min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])); switch (nr) { case 0: case 1: data->fan_div[nr] = DIV_TO_REG(val); break; case 2: if (val < 8) data->fan_div[nr] = 1; else data->fan_div[nr] = 3; } val = old & 0x80; val |= (data->fan_div[0] & 0x07); val |= (data->fan_div[1] & 0x07) << 3; if (data->fan_div[2] == 3) val |= 0x1 << 6; it87_write_value(data, IT87_REG_FAN_DIV, val); /* Restore fan min limit */ data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]); mutex_unlock(&data->update_lock); return count; } /* Returns 0 if OK, -EINVAL otherwise */ static int check_trip_points(struct device *dev, int nr) { const struct it87_data *data = dev_get_drvdata(dev); int i, err = 0; if (has_old_autopwm(data)) { for (i = 0; i < 3; i++) { if (data->auto_temp[nr][i] > data->auto_temp[nr][i + 1]) err = -EINVAL; } for (i = 0; i < 2; i++) { if (data->auto_pwm[nr][i] > data->auto_pwm[nr][i + 1]) err = -EINVAL; } } if (err) { dev_err(dev, "Inconsistent trip points, not switching to " "automatic mode\n"); dev_err(dev, "Adjust the trip points and try again\n"); } return err; } static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); long val; if (strict_strtol(buf, 10, &val) < 0 || val < 0 || val > 2) return -EINVAL; /* Check trip points before switching to automatic mode */ if (val == 2) { if (check_trip_points(dev, nr) < 0) return -EINVAL; } mutex_lock(&data->update_lock); if (val == 0) { int tmp; /* make sure the fan is on when in on/off mode */ tmp = it87_read_value(data, IT87_REG_FAN_CTL); it87_write_value(data, IT87_REG_FAN_CTL, tmp | (1 << nr)); /* set on/off mode */ data->fan_main_ctrl &= ~(1 << nr); it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl); } else { if (val == 1) /* Manual mode */ data->pwm_ctrl[nr] = data->pwm_duty[nr]; else /* Automatic mode */ data->pwm_ctrl[nr] = 0x80 | data->pwm_temp_map[nr]; it87_write_value(data, IT87_REG_PWM(nr), data->pwm_ctrl[nr]); /* set SmartGuardian mode */ data->fan_main_ctrl |= (1 << nr); it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl); } mutex_unlock(&data->update_lock); return count; } static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); long val; if (strict_strtol(buf, 10, &val) < 0 || val < 0 || val > 255) return -EINVAL; mutex_lock(&data->update_lock); data->pwm_duty[nr] = PWM_TO_REG(val); /* If we are in manual mode, write the duty cycle immediately; * otherwise, just store it for later use. */ if (!(data->pwm_ctrl[nr] & 0x80)) { data->pwm_ctrl[nr] = data->pwm_duty[nr]; it87_write_value(data, IT87_REG_PWM(nr), data->pwm_ctrl[nr]); } mutex_unlock(&data->update_lock); return count; } static ssize_t set_pwm_freq(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct it87_data *data = dev_get_drvdata(dev); unsigned long val; int i; if (strict_strtoul(buf, 10, &val) < 0) return -EINVAL; /* Search for the nearest available frequency */ for (i = 0; i < 7; i++) { if (val > (pwm_freq[i] + pwm_freq[i+1]) / 2) break; } mutex_lock(&data->update_lock); data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL) & 0x8f; data->fan_ctl |= i << 4; it87_write_value(data, IT87_REG_FAN_CTL, data->fan_ctl); mutex_unlock(&data->update_lock); return count; } static ssize_t show_pwm_temp_map(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); int map; if (data->pwm_temp_map[nr] < 3) map = 1 << data->pwm_temp_map[nr]; else map = 0; /* Should never happen */ return sprintf(buf, "%d\n", map); } static ssize_t set_pwm_temp_map(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); long val; u8 reg; /* This check can go away if we ever support automatic fan speed control on newer chips. */ if (!has_old_autopwm(data)) { dev_notice(dev, "Mapping change disabled for safety reasons\n"); return -EINVAL; } if (strict_strtol(buf, 10, &val) < 0) return -EINVAL; switch (val) { case (1 << 0): reg = 0x00; break; case (1 << 1): reg = 0x01; break; case (1 << 2): reg = 0x02; break; default: return -EINVAL; } mutex_lock(&data->update_lock); data->pwm_temp_map[nr] = reg; /* If we are in automatic mode, write the temp mapping immediately; * otherwise, just store it for later use. */ if (data->pwm_ctrl[nr] & 0x80) { data->pwm_ctrl[nr] = 0x80 | data->pwm_temp_map[nr]; it87_write_value(data, IT87_REG_PWM(nr), data->pwm_ctrl[nr]); } mutex_unlock(&data->update_lock); return count; } static ssize_t show_auto_pwm(struct device *dev, struct device_attribute *attr, char *buf) { struct it87_data *data = it87_update_device(dev); struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr); int nr = sensor_attr->nr; int point = sensor_attr->index; return sprintf(buf, "%d\n", PWM_FROM_REG(data->auto_pwm[nr][point])); } static ssize_t set_auto_pwm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct it87_data *data = dev_get_drvdata(dev); struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr); int nr = sensor_attr->nr; int point = sensor_attr->index; long val; if (strict_strtol(buf, 10, &val) < 0 || val < 0 || val > 255) return -EINVAL; mutex_lock(&data->update_lock); data->auto_pwm[nr][point] = PWM_TO_REG(val); it87_write_value(data, IT87_REG_AUTO_PWM(nr, point), data->auto_pwm[nr][point]); mutex_unlock(&data->update_lock); return count; } static ssize_t show_auto_temp(struct device *dev, struct device_attribute *attr, char *buf) { struct it87_data *data = it87_update_device(dev); struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr); int nr = sensor_attr->nr; int point = sensor_attr->index; return sprintf(buf, "%d\n", TEMP_FROM_REG(data->auto_temp[nr][point])); } static ssize_t set_auto_temp(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct it87_data *data = dev_get_drvdata(dev); struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr); int nr = sensor_attr->nr; int point = sensor_attr->index; long val; if (strict_strtol(buf, 10, &val) < 0 || val < -128000 || val > 127000) return -EINVAL; mutex_lock(&data->update_lock); data->auto_temp[nr][point] = TEMP_TO_REG(val); it87_write_value(data, IT87_REG_AUTO_TEMP(nr, point), data->auto_temp[nr][point]); mutex_unlock(&data->update_lock); return count; } #define show_fan_offset(offset) \ static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \ show_fan, NULL, offset - 1); \ static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ show_fan_min, set_fan_min, offset - 1); \ static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \ show_fan_div, set_fan_div, offset - 1); show_fan_offset(1); show_fan_offset(2); show_fan_offset(3); #define show_pwm_offset(offset) \ static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \ show_pwm_enable, set_pwm_enable, offset - 1); \ static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \ show_pwm, set_pwm, offset - 1); \ static DEVICE_ATTR(pwm##offset##_freq, \ (offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO), \ show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL)); \ static SENSOR_DEVICE_ATTR(pwm##offset##_auto_channels_temp, \ S_IRUGO | S_IWUSR, show_pwm_temp_map, set_pwm_temp_map, \ offset - 1); \ static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_pwm, \ S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm, \ offset - 1, 0); \ static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_pwm, \ S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm, \ offset - 1, 1); \ static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_pwm, \ S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm, \ offset - 1, 2); \ static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_pwm, \ S_IRUGO, show_auto_pwm, NULL, offset - 1, 3); \ static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp, \ S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp, \ offset - 1, 1); \ static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp_hyst, \ S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp, \ offset - 1, 0); \ static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_temp, \ S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp, \ offset - 1, 2); \ static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_temp, \ S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp, \ offset - 1, 3); \ static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_temp, \ S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp, \ offset - 1, 4); show_pwm_offset(1); show_pwm_offset(2); show_pwm_offset(3); /* A different set of callbacks for 16-bit fans */ static ssize_t show_fan16(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan[nr])); } static ssize_t show_fan16_min(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan_min[nr])); } static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; struct it87_data *data = dev_get_drvdata(dev); long val; if (strict_strtol(buf, 10, &val) < 0) return -EINVAL; mutex_lock(&data->update_lock); data->fan_min[nr] = FAN16_TO_REG(val); it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr] & 0xff); it87_write_value(data, IT87_REG_FANX_MIN[nr], data->fan_min[nr] >> 8); mutex_unlock(&data->update_lock); return count; } /* We want to use the same sysfs file names as 8-bit fans, but we need different variable names, so we have to use SENSOR_ATTR instead of SENSOR_DEVICE_ATTR. */ #define show_fan16_offset(offset) \ static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \ = SENSOR_ATTR(fan##offset##_input, S_IRUGO, \ show_fan16, NULL, offset - 1); \ static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \ = SENSOR_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ show_fan16_min, set_fan16_min, offset - 1) show_fan16_offset(1); show_fan16_offset(2); show_fan16_offset(3); show_fan16_offset(4); show_fan16_offset(5); /* Alarms */ static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) { struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%u\n", data->alarms); } static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, char *buf) { int bitnr = to_sensor_dev_attr(attr)->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); } static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 8); static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 9); static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 10); static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 11); static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 12); static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 13); static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 14); static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 15); static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 0); static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 1); static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 2); static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 3); static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 6); static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 16); static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 17); static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 18); static ssize_t show_beep(struct device *dev, struct device_attribute *attr, char *buf) { int bitnr = to_sensor_dev_attr(attr)->index; struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%u\n", (data->beeps >> bitnr) & 1); } static ssize_t set_beep(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int bitnr = to_sensor_dev_attr(attr)->index; struct it87_data *data = dev_get_drvdata(dev); long val; if (strict_strtol(buf, 10, &val) < 0 || (val != 0 && val != 1)) return -EINVAL; mutex_lock(&data->update_lock); data->beeps = it87_read_value(data, IT87_REG_BEEP_ENABLE); if (val) data->beeps |= (1 << bitnr); else data->beeps &= ~(1 << bitnr); it87_write_value(data, IT87_REG_BEEP_ENABLE, data->beeps); mutex_unlock(&data->update_lock); return count; } static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO | S_IWUSR, show_beep, set_beep, 1); static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO, show_beep, NULL, 1); static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO, show_beep, NULL, 1); static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO, show_beep, NULL, 1); static SENSOR_DEVICE_ATTR(in4_beep, S_IRUGO, show_beep, NULL, 1); static SENSOR_DEVICE_ATTR(in5_beep, S_IRUGO, show_beep, NULL, 1); static SENSOR_DEVICE_ATTR(in6_beep, S_IRUGO, show_beep, NULL, 1); static SENSOR_DEVICE_ATTR(in7_beep, S_IRUGO, show_beep, NULL, 1); /* fanX_beep writability is set later */ static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO, show_beep, set_beep, 0); static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO, show_beep, set_beep, 0); static SENSOR_DEVICE_ATTR(fan3_beep, S_IRUGO, show_beep, set_beep, 0); static SENSOR_DEVICE_ATTR(fan4_beep, S_IRUGO, show_beep, set_beep, 0); static SENSOR_DEVICE_ATTR(fan5_beep, S_IRUGO, show_beep, set_beep, 0); static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO | S_IWUSR, show_beep, set_beep, 2); static SENSOR_DEVICE_ATTR(temp2_beep, S_IRUGO, show_beep, NULL, 2); static SENSOR_DEVICE_ATTR(temp3_beep, S_IRUGO, show_beep, NULL, 2); static ssize_t show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf) { struct it87_data *data = dev_get_drvdata(dev); return sprintf(buf, "%u\n", data->vrm); } static ssize_t store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct it87_data *data = dev_get_drvdata(dev); unsigned long val; if (strict_strtoul(buf, 10, &val) < 0) return -EINVAL; data->vrm = val; return count; } static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg); static ssize_t show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf) { struct it87_data *data = it87_update_device(dev); return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm)); } static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL); static ssize_t show_name(struct device *dev, struct device_attribute *devattr, char *buf) { struct it87_data *data = dev_get_drvdata(dev); return sprintf(buf, "%s\n", data->name); } static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); static struct attribute *it87_attributes[] = { &sensor_dev_attr_in0_input.dev_attr.attr, &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_in3_input.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, &sensor_dev_attr_in5_input.dev_attr.attr, &sensor_dev_attr_in6_input.dev_attr.attr, &sensor_dev_attr_in7_input.dev_attr.attr, &sensor_dev_attr_in8_input.dev_attr.attr, &sensor_dev_attr_in0_min.dev_attr.attr, &sensor_dev_attr_in1_min.dev_attr.attr, &sensor_dev_attr_in2_min.dev_attr.attr, &sensor_dev_attr_in3_min.dev_attr.attr, &sensor_dev_attr_in4_min.dev_attr.attr, &sensor_dev_attr_in5_min.dev_attr.attr, &sensor_dev_attr_in6_min.dev_attr.attr, &sensor_dev_attr_in7_min.dev_attr.attr, &sensor_dev_attr_in0_max.dev_attr.attr, &sensor_dev_attr_in1_max.dev_attr.attr, &sensor_dev_attr_in2_max.dev_attr.attr, &sensor_dev_attr_in3_max.dev_attr.attr, &sensor_dev_attr_in4_max.dev_attr.attr, &sensor_dev_attr_in5_max.dev_attr.attr, &sensor_dev_attr_in6_max.dev_attr.attr, &sensor_dev_attr_in7_max.dev_attr.attr, &sensor_dev_attr_in0_alarm.dev_attr.attr, &sensor_dev_attr_in1_alarm.dev_attr.attr, &sensor_dev_attr_in2_alarm.dev_attr.attr, &sensor_dev_attr_in3_alarm.dev_attr.attr, &sensor_dev_attr_in4_alarm.dev_attr.attr, &sensor_dev_attr_in5_alarm.dev_attr.attr, &sensor_dev_attr_in6_alarm.dev_attr.attr, &sensor_dev_attr_in7_alarm.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp3_input.dev_attr.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp2_max.dev_attr.attr, &sensor_dev_attr_temp3_max.dev_attr.attr, &sensor_dev_attr_temp1_min.dev_attr.attr, &sensor_dev_attr_temp2_min.dev_attr.attr, &sensor_dev_attr_temp3_min.dev_attr.attr, &sensor_dev_attr_temp1_type.dev_attr.attr, &sensor_dev_attr_temp2_type.dev_attr.attr, &sensor_dev_attr_temp3_type.dev_attr.attr, &sensor_dev_attr_temp1_alarm.dev_attr.attr, &sensor_dev_attr_temp2_alarm.dev_attr.attr, &sensor_dev_attr_temp3_alarm.dev_attr.attr, &dev_attr_alarms.attr, &dev_attr_name.attr, NULL }; static const struct attribute_group it87_group = { .attrs = it87_attributes, }; static struct attribute *it87_attributes_beep[] = { &sensor_dev_attr_in0_beep.dev_attr.attr, &sensor_dev_attr_in1_beep.dev_attr.attr, &sensor_dev_attr_in2_beep.dev_attr.attr, &sensor_dev_attr_in3_beep.dev_attr.attr, &sensor_dev_attr_in4_beep.dev_attr.attr, &sensor_dev_attr_in5_beep.dev_attr.attr, &sensor_dev_attr_in6_beep.dev_attr.attr, &sensor_dev_attr_in7_beep.dev_attr.attr, &sensor_dev_attr_temp1_beep.dev_attr.attr, &sensor_dev_attr_temp2_beep.dev_attr.attr, &sensor_dev_attr_temp3_beep.dev_attr.attr, NULL }; static const struct attribute_group it87_group_beep = { .attrs = it87_attributes_beep, }; static struct attribute *it87_attributes_fan16[5][3+1] = { { &sensor_dev_attr_fan1_input16.dev_attr.attr, &sensor_dev_attr_fan1_min16.dev_attr.attr, &sensor_dev_attr_fan1_alarm.dev_attr.attr, NULL }, { &sensor_dev_attr_fan2_input16.dev_attr.attr, &sensor_dev_attr_fan2_min16.dev_attr.attr, &sensor_dev_attr_fan2_alarm.dev_attr.attr, NULL }, { &sensor_dev_attr_fan3_input16.dev_attr.attr, &sensor_dev_attr_fan3_min16.dev_attr.attr, &sensor_dev_attr_fan3_alarm.dev_attr.attr, NULL }, { &sensor_dev_attr_fan4_input16.dev_attr.attr, &sensor_dev_attr_fan4_min16.dev_attr.attr, &sensor_dev_attr_fan4_alarm.dev_attr.attr, NULL }, { &sensor_dev_attr_fan5_input16.dev_attr.attr, &sensor_dev_attr_fan5_min16.dev_attr.attr, &sensor_dev_attr_fan5_alarm.dev_attr.attr, NULL } }; static const struct attribute_group it87_group_fan16[5] = { { .attrs = it87_attributes_fan16[0] }, { .attrs = it87_attributes_fan16[1] }, { .attrs = it87_attributes_fan16[2] }, { .attrs = it87_attributes_fan16[3] }, { .attrs = it87_attributes_fan16[4] }, }; static struct attribute *it87_attributes_fan[3][4+1] = { { &sensor_dev_attr_fan1_input.dev_attr.attr, &sensor_dev_attr_fan1_min.dev_attr.attr, &sensor_dev_attr_fan1_div.dev_attr.attr, &sensor_dev_attr_fan1_alarm.dev_attr.attr, NULL }, { &sensor_dev_attr_fan2_input.dev_attr.attr, &sensor_dev_attr_fan2_min.dev_attr.attr, &sensor_dev_attr_fan2_div.dev_attr.attr, &sensor_dev_attr_fan2_alarm.dev_attr.attr, NULL }, { &sensor_dev_attr_fan3_input.dev_attr.attr, &sensor_dev_attr_fan3_min.dev_attr.attr, &sensor_dev_attr_fan3_div.dev_attr.attr, &sensor_dev_attr_fan3_alarm.dev_attr.attr, NULL } }; static const struct attribute_group it87_group_fan[3] = { { .attrs = it87_attributes_fan[0] }, { .attrs = it87_attributes_fan[1] }, { .attrs = it87_attributes_fan[2] }, }; static const struct attribute_group * it87_get_fan_group(const struct it87_data *data) { return has_16bit_fans(data) ? it87_group_fan16 : it87_group_fan; } static struct attribute *it87_attributes_pwm[3][4+1] = { { &sensor_dev_attr_pwm1_enable.dev_attr.attr, &sensor_dev_attr_pwm1.dev_attr.attr, &dev_attr_pwm1_freq.attr, &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr, NULL }, { &sensor_dev_attr_pwm2_enable.dev_attr.attr, &sensor_dev_attr_pwm2.dev_attr.attr, &dev_attr_pwm2_freq.attr, &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr, NULL }, { &sensor_dev_attr_pwm3_enable.dev_attr.attr, &sensor_dev_attr_pwm3.dev_attr.attr, &dev_attr_pwm3_freq.attr, &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr, NULL } }; static const struct attribute_group it87_group_pwm[3] = { { .attrs = it87_attributes_pwm[0] }, { .attrs = it87_attributes_pwm[1] }, { .attrs = it87_attributes_pwm[2] }, }; static struct attribute *it87_attributes_autopwm[3][9+1] = { { &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point1_temp_hyst.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr, NULL }, { &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr, &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr, &sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr, &sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr, &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr, &sensor_dev_attr_pwm2_auto_point1_temp_hyst.dev_attr.attr, &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr, &sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr, &sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr, NULL }, { &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr, &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr, &sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr, &sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr, &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr, &sensor_dev_attr_pwm3_auto_point1_temp_hyst.dev_attr.attr, &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr, &sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr, &sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr, NULL } }; static const struct attribute_group it87_group_autopwm[3] = { { .attrs = it87_attributes_autopwm[0] }, { .attrs = it87_attributes_autopwm[1] }, { .attrs = it87_attributes_autopwm[2] }, }; static struct attribute *it87_attributes_fan_beep[] = { &sensor_dev_attr_fan1_beep.dev_attr.attr, &sensor_dev_attr_fan2_beep.dev_attr.attr, &sensor_dev_attr_fan3_beep.dev_attr.attr, &sensor_dev_attr_fan4_beep.dev_attr.attr, &sensor_dev_attr_fan5_beep.dev_attr.attr, }; static struct attribute *it87_attributes_vid[] = { &dev_attr_vrm.attr, &dev_attr_cpu0_vid.attr, NULL }; static const struct attribute_group it87_group_vid = { .attrs = it87_attributes_vid, }; /* SuperIO detection - will change isa_address if a chip is found */ static int __init it87_find(unsigned short *address, struct it87_sio_data *sio_data) { int err = -ENODEV; u16 chip_type; const char *board_vendor, *board_name; superio_enter(); chip_type = force_id ? force_id : superio_inw(DEVID); switch (chip_type) { case IT8705F_DEVID: sio_data->type = it87; break; case IT8712F_DEVID: sio_data->type = it8712; break; case IT8716F_DEVID: case IT8726F_DEVID: sio_data->type = it8716; break; case IT8718F_DEVID: sio_data->type = it8718; break; case IT8720F_DEVID: sio_data->type = it8720; break; case 0xffff: /* No device at all */ goto exit; default: pr_debug(DRVNAME ": Unsupported chip (DEVID=0x%x)\n", chip_type); goto exit; } superio_select(PME); if (!(superio_inb(IT87_ACT_REG) & 0x01)) { pr_info("it87: Device not activated, skipping\n"); goto exit; } *address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1); if (*address == 0) { pr_info("it87: Base address not set, skipping\n"); goto exit; } err = 0; sio_data->revision = superio_inb(DEVREV) & 0x0f; pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n", chip_type, *address, sio_data->revision); /* Read GPIO config and VID value from LDN 7 (GPIO) */ if (sio_data->type == it87) { /* The IT8705F doesn't have VID pins at all */ sio_data->skip_vid = 1; /* The IT8705F has a different LD number for GPIO */ superio_select(5); sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f; } else { int reg; superio_select(GPIO); /* We need at least 4 VID pins */ reg = superio_inb(IT87_SIO_GPIO3_REG); if (reg & 0x0f) { pr_info("it87: VID is disabled (pins used for GPIO)\n"); sio_data->skip_vid = 1; } /* Check if fan3 is there or not */ if (reg & (1 << 6)) sio_data->skip_pwm |= (1 << 2); if (reg & (1 << 7)) sio_data->skip_fan |= (1 << 2); /* Check if fan2 is there or not */ reg = superio_inb(IT87_SIO_GPIO5_REG); if (reg & (1 << 1)) sio_data->skip_pwm |= (1 << 1); if (reg & (1 << 2)) sio_data->skip_fan |= (1 << 1); if ((sio_data->type == it8718 || sio_data->type == it8720) && !(sio_data->skip_vid)) sio_data->vid_value = superio_inb(IT87_SIO_VID_REG); reg = superio_inb(IT87_SIO_PINX2_REG); if (reg & (1 << 0)) pr_info("it87: in3 is VCC (+5V)\n"); if (reg & (1 << 1)) pr_info("it87: in7 is VCCH (+5V Stand-By)\n"); sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f; } if (sio_data->beep_pin) pr_info("it87: Beeping is supported\n"); /* Disable specific features based on DMI strings */ board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR); board_name = dmi_get_system_info(DMI_BOARD_NAME); if (board_vendor && board_name) { if (strcmp(board_vendor, "nVIDIA") == 0 && strcmp(board_name, "FN68PT") == 0) { /* On the Shuttle SN68PT, FAN_CTL2 is apparently not connected to a fan, but to something else. One user has reported instant system power-off when changing the PWM2 duty cycle, so we disable it. I use the board name string as the trigger in case the same board is ever used in other systems. */ pr_info("it87: Disabling pwm2 due to " "hardware constraints\n"); sio_data->skip_pwm = (1 << 1); } } exit: superio_exit(); return err; } static void it87_remove_files(struct device *dev) { struct it87_data *data = platform_get_drvdata(pdev); struct it87_sio_data *sio_data = dev->platform_data; const struct attribute_group *fan_group = it87_get_fan_group(data); int i; sysfs_remove_group(&dev->kobj, &it87_group); if (sio_data->beep_pin) sysfs_remove_group(&dev->kobj, &it87_group_beep); for (i = 0; i < 5; i++) { if (!(data->has_fan & (1 << i))) continue; sysfs_remove_group(&dev->kobj, &fan_group[i]); if (sio_data->beep_pin) sysfs_remove_file(&dev->kobj, it87_attributes_fan_beep[i]); } for (i = 0; i < 3; i++) { if (sio_data->skip_pwm & (1 << 0)) continue; sysfs_remove_group(&dev->kobj, &it87_group_pwm[i]); if (has_old_autopwm(data)) sysfs_remove_group(&dev->kobj, &it87_group_autopwm[i]); } if (!sio_data->skip_vid) sysfs_remove_group(&dev->kobj, &it87_group_vid); } static int __devinit it87_probe(struct platform_device *pdev) { struct it87_data *data; struct resource *res; struct device *dev = &pdev->dev; struct it87_sio_data *sio_data = dev->platform_data; const struct attribute_group *fan_group; int err = 0, i; int enable_pwm_interface; int fan_beep_need_rw; static const char *names[] = { "it87", "it8712", "it8716", "it8718", "it8720", }; res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (!request_region(res->start, IT87_EC_EXTENT, DRVNAME)) { dev_err(dev, "Failed to request region 0x%lx-0x%lx\n", (unsigned long)res->start, (unsigned long)(res->start + IT87_EC_EXTENT - 1)); err = -EBUSY; goto ERROR0; } data = kzalloc(sizeof(struct it87_data), GFP_KERNEL); if (!data) { err = -ENOMEM; goto ERROR1; } data->addr = res->start; data->type = sio_data->type; data->revision = sio_data->revision; data->name = names[sio_data->type]; /* Now, we do the remaining detection. */ if ((it87_read_value(data, IT87_REG_CONFIG) & 0x80) || it87_read_value(data, IT87_REG_CHIPID) != 0x90) { err = -ENODEV; goto ERROR2; } platform_set_drvdata(pdev, data); mutex_init(&data->update_lock); /* Check PWM configuration */ enable_pwm_interface = it87_check_pwm(dev); /* Initialize the IT87 chip */ it87_init_device(pdev); /* Register sysfs hooks */ err = sysfs_create_group(&dev->kobj, &it87_group); if (err) goto ERROR2; if (sio_data->beep_pin) { err = sysfs_create_group(&dev->kobj, &it87_group_beep); if (err) goto ERROR4; } /* Do not create fan files for disabled fans */ fan_group = it87_get_fan_group(data); fan_beep_need_rw = 1; for (i = 0; i < 5; i++) { if (!(data->has_fan & (1 << i))) continue; err = sysfs_create_group(&dev->kobj, &fan_group[i]); if (err) goto ERROR4; if (sio_data->beep_pin) { err = sysfs_create_file(&dev->kobj, it87_attributes_fan_beep[i]); if (err) goto ERROR4; if (!fan_beep_need_rw) continue; /* As we have a single beep enable bit for all fans, * only the first enabled fan has a writable attribute * for it. */ if (sysfs_chmod_file(&dev->kobj, it87_attributes_fan_beep[i], S_IRUGO | S_IWUSR)) dev_dbg(dev, "chmod +w fan%d_beep failed\n", i + 1); fan_beep_need_rw = 0; } } if (enable_pwm_interface) { for (i = 0; i < 3; i++) { if (sio_data->skip_pwm & (1 << i)) continue; err = sysfs_create_group(&dev->kobj, &it87_group_pwm[i]); if (err) goto ERROR4; if (!has_old_autopwm(data)) continue; err = sysfs_create_group(&dev->kobj, &it87_group_autopwm[i]); if (err) goto ERROR4; } } if (!sio_data->skip_vid) { data->vrm = vid_which_vrm(); /* VID reading from Super-I/O config space if available */ data->vid = sio_data->vid_value; err = sysfs_create_group(&dev->kobj, &it87_group_vid); if (err) goto ERROR4; } data->hwmon_dev = hwmon_device_register(dev); if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); goto ERROR4; } return 0; ERROR4: it87_remove_files(dev); ERROR2: platform_set_drvdata(pdev, NULL); kfree(data); ERROR1: release_region(res->start, IT87_EC_EXTENT); ERROR0: return err; } static int __devexit it87_remove(struct platform_device *pdev) { struct it87_data *data = platform_get_drvdata(pdev); hwmon_device_unregister(data->hwmon_dev); it87_remove_files(&pdev->dev); release_region(data->addr, IT87_EC_EXTENT); platform_set_drvdata(pdev, NULL); kfree(data); return 0; } /* Must be called with data->update_lock held, except during initialization. We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks, would slow down the IT87 access and should not be necessary. */ static int it87_read_value(struct it87_data *data, u8 reg) { outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET); return inb_p(data->addr + IT87_DATA_REG_OFFSET); } /* Must be called with data->update_lock held, except during initialization. We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks, would slow down the IT87 access and should not be necessary. */ static void it87_write_value(struct it87_data *data, u8 reg, u8 value) { outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET); outb_p(value, data->addr + IT87_DATA_REG_OFFSET); } /* Return 1 if and only if the PWM interface is safe to use */ static int __devinit it87_check_pwm(struct device *dev) { struct it87_data *data = dev_get_drvdata(dev); /* Some BIOSes fail to correctly configure the IT87 fans. All fans off * and polarity set to active low is sign that this is the case so we * disable pwm control to protect the user. */ int tmp = it87_read_value(data, IT87_REG_FAN_CTL); if ((tmp & 0x87) == 0) { if (fix_pwm_polarity) { /* The user asks us to attempt a chip reconfiguration. * This means switching to active high polarity and * inverting all fan speed values. */ int i; u8 pwm[3]; for (i = 0; i < 3; i++) pwm[i] = it87_read_value(data, IT87_REG_PWM(i)); /* If any fan is in automatic pwm mode, the polarity * might be correct, as suspicious as it seems, so we * better don't change anything (but still disable the * PWM interface). */ if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) { dev_info(dev, "Reconfiguring PWM to " "active high polarity\n"); it87_write_value(data, IT87_REG_FAN_CTL, tmp | 0x87); for (i = 0; i < 3; i++) it87_write_value(data, IT87_REG_PWM(i), 0x7f & ~pwm[i]); return 1; } dev_info(dev, "PWM configuration is " "too broken to be fixed\n"); } dev_info(dev, "Detected broken BIOS " "defaults, disabling PWM interface\n"); return 0; } else if (fix_pwm_polarity) { dev_info(dev, "PWM configuration looks " "sane, won't touch\n"); } return 1; } /* Called when we have found a new IT87. */ static void __devinit it87_init_device(struct platform_device *pdev) { struct it87_sio_data *sio_data = pdev->dev.platform_data; struct it87_data *data = platform_get_drvdata(pdev); int tmp, i; u8 mask; /* For each PWM channel: * - If it is in automatic mode, setting to manual mode should set * the fan to full speed by default. * - If it is in manual mode, we need a mapping to temperature * channels to use when later setting to automatic mode later. * Use a 1:1 mapping by default (we are clueless.) * In both cases, the value can (and should) be changed by the user * prior to switching to a different mode. */ for (i = 0; i < 3; i++) { data->pwm_temp_map[i] = i; data->pwm_duty[i] = 0x7f; /* Full speed */ data->auto_pwm[i][3] = 0x7f; /* Full speed, hard-coded */ } /* Some chips seem to have default value 0xff for all limit * registers. For low voltage limits it makes no sense and triggers * alarms, so change to 0 instead. For high temperature limits, it * means -1 degree C, which surprisingly doesn't trigger an alarm, * but is still confusing, so change to 127 degrees C. */ for (i = 0; i < 8; i++) { tmp = it87_read_value(data, IT87_REG_VIN_MIN(i)); if (tmp == 0xff) it87_write_value(data, IT87_REG_VIN_MIN(i), 0); } for (i = 0; i < 3; i++) { tmp = it87_read_value(data, IT87_REG_TEMP_HIGH(i)); if (tmp == 0xff) it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127); } /* Temperature channels are not forcibly enabled, as they can be * set to two different sensor types and we can't guess which one * is correct for a given system. These channels can be enabled at * run-time through the temp{1-3}_type sysfs accessors if needed. */ /* Check if voltage monitors are reset manually or by some reason */ tmp = it87_read_value(data, IT87_REG_VIN_ENABLE); if ((tmp & 0xff) == 0) { /* Enable all voltage monitors */ it87_write_value(data, IT87_REG_VIN_ENABLE, 0xff); } /* Check if tachometers are reset manually or by some reason */ mask = 0x70 & ~(sio_data->skip_fan << 4); data->fan_main_ctrl = it87_read_value(data, IT87_REG_FAN_MAIN_CTRL); if ((data->fan_main_ctrl & mask) == 0) { /* Enable all fan tachometers */ data->fan_main_ctrl |= mask; it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl); } data->has_fan = (data->fan_main_ctrl >> 4) & 0x07; /* Set tachometers to 16-bit mode if needed */ if (has_16bit_fans(data)) { tmp = it87_read_value(data, IT87_REG_FAN_16BIT); if (~tmp & 0x07 & data->has_fan) { dev_dbg(&pdev->dev, "Setting fan1-3 to 16-bit mode\n"); it87_write_value(data, IT87_REG_FAN_16BIT, tmp | 0x07); } /* IT8705F only supports three fans. */ if (data->type != it87) { if (tmp & (1 << 4)) data->has_fan |= (1 << 3); /* fan4 enabled */ if (tmp & (1 << 5)) data->has_fan |= (1 << 4); /* fan5 enabled */ } } /* Fan input pins may be used for alternative functions */ data->has_fan &= ~sio_data->skip_fan; /* Start monitoring */ it87_write_value(data, IT87_REG_CONFIG, (it87_read_value(data, IT87_REG_CONFIG) & 0x36) | (update_vbat ? 0x41 : 0x01)); } static void it87_update_pwm_ctrl(struct it87_data *data, int nr) { data->pwm_ctrl[nr] = it87_read_value(data, IT87_REG_PWM(nr)); if (data->pwm_ctrl[nr] & 0x80) /* Automatic mode */ data->pwm_temp_map[nr] = data->pwm_ctrl[nr] & 0x03; else /* Manual mode */ data->pwm_duty[nr] = data->pwm_ctrl[nr] & 0x7f; if (has_old_autopwm(data)) { int i; for (i = 0; i < 5 ; i++) data->auto_temp[nr][i] = it87_read_value(data, IT87_REG_AUTO_TEMP(nr, i)); for (i = 0; i < 3 ; i++) data->auto_pwm[nr][i] = it87_read_value(data, IT87_REG_AUTO_PWM(nr, i)); } } static struct it87_data *it87_update_device(struct device *dev) { struct it87_data *data = dev_get_drvdata(dev); int i; mutex_lock(&data->update_lock); if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || !data->valid) { if (update_vbat) { /* Cleared after each update, so reenable. Value returned by this read will be previous value */ it87_write_value(data, IT87_REG_CONFIG, it87_read_value(data, IT87_REG_CONFIG) | 0x40); } for (i = 0; i <= 7; i++) { data->in[i] = it87_read_value(data, IT87_REG_VIN(i)); data->in_min[i] = it87_read_value(data, IT87_REG_VIN_MIN(i)); data->in_max[i] = it87_read_value(data, IT87_REG_VIN_MAX(i)); } /* in8 (battery) has no limit registers */ data->in[8] = it87_read_value(data, IT87_REG_VIN(8)); for (i = 0; i < 5; i++) { /* Skip disabled fans */ if (!(data->has_fan & (1 << i))) continue; data->fan_min[i] = it87_read_value(data, IT87_REG_FAN_MIN[i]); data->fan[i] = it87_read_value(data, IT87_REG_FAN[i]); /* Add high byte if in 16-bit mode */ if (has_16bit_fans(data)) { data->fan[i] |= it87_read_value(data, IT87_REG_FANX[i]) << 8; data->fan_min[i] |= it87_read_value(data, IT87_REG_FANX_MIN[i]) << 8; } } for (i = 0; i < 3; i++) { data->temp[i] = it87_read_value(data, IT87_REG_TEMP(i)); data->temp_high[i] = it87_read_value(data, IT87_REG_TEMP_HIGH(i)); data->temp_low[i] = it87_read_value(data, IT87_REG_TEMP_LOW(i)); } /* Newer chips don't have clock dividers */ if ((data->has_fan & 0x07) && !has_16bit_fans(data)) { i = it87_read_value(data, IT87_REG_FAN_DIV); data->fan_div[0] = i & 0x07; data->fan_div[1] = (i >> 3) & 0x07; data->fan_div[2] = (i & 0x40) ? 3 : 1; } data->alarms = it87_read_value(data, IT87_REG_ALARM1) | (it87_read_value(data, IT87_REG_ALARM2) << 8) | (it87_read_value(data, IT87_REG_ALARM3) << 16); data->beeps = it87_read_value(data, IT87_REG_BEEP_ENABLE); data->fan_main_ctrl = it87_read_value(data, IT87_REG_FAN_MAIN_CTRL); data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL); for (i = 0; i < 3; i++) it87_update_pwm_ctrl(data, i); data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE); /* The 8705 does not have VID capability. The 8718 and the 8720 don't use IT87_REG_VID for the same purpose. */ if (data->type == it8712 || data->type == it8716) { data->vid = it87_read_value(data, IT87_REG_VID); /* The older IT8712F revisions had only 5 VID pins, but we assume it is always safe to read 6 bits. */ data->vid &= 0x3f; } data->last_updated = jiffies; data->valid = 1; } mutex_unlock(&data->update_lock); return data; } static int __init it87_device_add(unsigned short address, const struct it87_sio_data *sio_data) { struct resource res = { .start = address + IT87_EC_OFFSET, .end = address + IT87_EC_OFFSET + IT87_EC_EXTENT - 1, .name = DRVNAME, .flags = IORESOURCE_IO, }; int err; err = acpi_check_resource_conflict(&res); if (err) goto exit; pdev = platform_device_alloc(DRVNAME, address); if (!pdev) { err = -ENOMEM; printk(KERN_ERR DRVNAME ": Device allocation failed\n"); goto exit; } err = platform_device_add_resources(pdev, &res, 1); if (err) { printk(KERN_ERR DRVNAME ": Device resource addition failed " "(%d)\n", err); goto exit_device_put; } err = platform_device_add_data(pdev, sio_data, sizeof(struct it87_sio_data)); if (err) { printk(KERN_ERR DRVNAME ": Platform data allocation failed\n"); goto exit_device_put; } err = platform_device_add(pdev); if (err) { printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", err); goto exit_device_put; } return 0; exit_device_put: platform_device_put(pdev); exit: return err; } static int __init sm_it87_init(void) { int err; unsigned short isa_address = 0; struct it87_sio_data sio_data; memset(&sio_data, 0, sizeof(struct it87_sio_data)); err = it87_find(&isa_address, &sio_data); if (err) return err; err = platform_driver_register(&it87_driver); if (err) return err; err = it87_device_add(isa_address, &sio_data); if (err) { platform_driver_unregister(&it87_driver); return err; } return 0; } static void __exit sm_it87_exit(void) { platform_device_unregister(pdev); platform_driver_unregister(&it87_driver); } MODULE_AUTHOR("Chris Gauthron, " "Jean Delvare "); MODULE_DESCRIPTION("IT8705F/8712F/8716F/8718F/8720F/8726F, SiS950 driver"); module_param(update_vbat, bool, 0); MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value"); module_param(fix_pwm_polarity, bool, 0); MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)"); MODULE_LICENSE("GPL"); module_init(sm_it87_init); module_exit(sm_it87_exit);